Why Would an Advertiser Use a Mixed-Media Approach

Why would an advertiser use a mixed-media approach?

A) It is less expensive than a homogeneous media mix.
B) It gives more exposure than a heterogeneous media plan.
C) It is easier to schedule than any other type of media mix.
D) It produces an effect where the sum of the parts is greater than that expected by adding the individual parts.
E) It produces a homogeneous effect,which reflects the segmentation variables of the targeted audience.